389
FXUS66 KSGX 110408
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
908 PM PDT Thu Apr 10 2025

.SYNOPSIS...
Warm weather will continue over the region through Friday with a
subtle cooling trend through the weekend. High pressure aloft will
contribute to a shallow marine layer with foggy conditions near the
beaches through Friday as well. Low clouds and fog will move further
inland by the weekend as a troughing pattern sets up across the
region. This will also bring breezy conditions across the mountains
and deserts. This pattern will continue into next week with minimal
day to day changes in the weather pattern with highs above average
inland and near average closer to the coast.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

It was a toasty day for inland locations. Highs in the valleys and
High Desert reached the 80s and 90s; upper 90s to 101 degrees in the
low deserts; and 70s to near 80 degrees in the mountains. Only one
high temperature record was reached, with Palm Springs tying it`s
daily high temperature record of 101 degrees. Highs tomorrow are
expected to be quite toasty as well. Palm Springs, Campo, Big Bear
Lake, and Ramona are forecast to tie or break high temperature
records Friday.

At 9 PM, areas of fog were lingering along the immediate coast. Fog
coverage will become more widespread overnight but will remain
within a few miles of the coast. In areas of fog, visibility of 1
mile or less is expected. Patchy fog is expected to linger along
some beaches into Friday afternoon.

Previous discussion issued at 2 PM April 10, 2025...

An area of high pressure centered over Baja California is currently
peaking in strength. This will continue the sunny skies and warm
temperatures across the region into Friday, along with a shallow
marine layer with foggy conditions at the coast. The hottest
temperatures of the next seven days will occur for most areas on
Friday as well. Confidence is moderate to high in seeing
temperatures hit at least 100 degrees across the Anza-Borrego Desert
and the Coachella Valley. Like today, highs will again be near 90
degrees from the high desert, Inland Empire and far inland
valleys/foothills of SD County.

A trough off the coast will move closer to the region by the
weekend, bringing temperatures down by 5-10 degrees from where they
will be on Friday. The troughing pattern will also bring windier
conditions across the mountains and adjacent deserts as NBM and WRF
models show chances of seeing wind gusts over 30 MPH.
This chance will be lower on Friday near 20-50%, increasing 40-70%
by Saturday. West winds will favor the San Gorgonio Pass to see the
highest winds. The marine layer will deepen with the passage of this
system as well, where low clouds will extend further into the
valleys with fog more confined to higher coastal terrain.

Models are in fairly good agreement on a series of weak low pressure
systems moving through the region next week. This would continue the
benign weather pattern with highs slightly above average inland and
near average for the coastal areas with night/morning low clouds as
well.

&&

.AVIATION...
110300Z...Coast...Patchy areas of low clouds/fog along northern San
Diego County this evening will start to expand along the coast and
into areas within a few miles late tonight after 06Z. Bases 200-400
ft MSL with vis reductions 0-2 SM where clouds are present. 50%
chance for impacts at KSAN by 09Z, with KCRQ and KSNA likely
remaining mostly clear again (30% chance for impacts). Fog clearing
to the beaches 15-17Z, where they will again linger in areas through
the afternoon. Low clouds with slightly higher bases developing and
moving inland again after 05Z Sat.

Elsewhere...Mostly clear skies tonight and Friday with VFR
conditions.

&&

.MARINE...
Areas of fog with visibility 1 NM or less are expected again through
Friday morning. Otherwise, no hazardous marine conditions are
expected through Monday.

&&

.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...None.

&&

$$

PUBLIC...CO
AVIATION/MARINE...CSP